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Alice Rischert gives a realistic introduction to the expend of SQL*Plus to question Oracle databases, with tutorials to back you accumulate begun. Spotlighted are the select statement, and the region and ORDER with the aid of clauses.This chapter is from the booklet
in this chapter, you will learn about:
Now that you are time-honored with the concepts of databases and schema diagrams, you're able to birth with hands-on exercises. you are going to gain scholarship of the fundamentals of SQL*Plus, the utility device that lets you execute statements against the Oracle database. After you become intimate with SQL*Plus, you will live ready to write SQL statements, or queries, to retrieve the records. SQL statements can latitude from very benchmark to particularly advanced; they will besides live a number of words long or a number of hundred words long. in this chapter, you commence by writing fundamental SQL statements, however you could live in a position to build longer, greater intricate SQL queries very immediately.Lab 2.1: The SQL*Plus atmosphere
After this lab, you should live in a position to:
Oracle utility runs on numerous operating systems and hardware environments. that you may expend the SQL*Plus software under three several architectural configurations: as a stand-alone computer, in a consumer–server setup, or as iSQL*Plus inside a three-tier structure. a further piece of Oracle application, known as SQL*net (edition 7), Net8 (version eight), or Oracle web (version 9i and 10g), gives the mandatory conversation protocol to the server.STAND-alone environment
SQL*Plus may well live elope in a stand-on my own ambiance, where each the SQL*Plus client software and the Oracle database software sojourn on the identical actual desktop. this is the case in case you deploy each the Oracle database server and the SQL*Plus application on your individual desktop.customer–Server
a typical setup is a client–server atmosphere, besides referred to as two-tier structure, the region a client communicates with the server. during this class of atmosphere, Oracle's SQL*Plus device resides on a consumer computing device comparable to a computer or Unix computing device; the Oracle RDBMS application resides on a server. determine 2.1 suggests such a shopper–server architecture.
figure 2.1 customer–server architecture.
The customer sends SQL statements to the server, and the server responds returned with the outcome set. The job of the database server involves listening and managing many purchasers' requests, because in this configuration there are sometimes diverse customer machines involved.
as an alternative of Oracle's SQL*Plus program, the client laptop may besides elope another program with the means to execute SQL statements towards a database (e.g., visual fundamental or a custom-constructed Java program). For the customer desktop's programs to speak with the Oracle database server, the particular person client laptop is typically configured with the Oracle net software, or the customer may establish an Open Database Connectivity (ODBC) connection.Three-Tier structure
beginning with Oracle eight.1.7, that you may expend the iSQL*Plus interface in a web browser to access the Oracle database. It performs the identical movements as SQL*Plus. The scholarship of iSQL*Plus is that you simply don't requisite to installation and configure the SQL*Plus program or Oracle web utility to your customer machine. so long as you utilize a usurp browser for your machine and understand the URL of the Oracle HTTP server, that you could entry the database. as with impeccable connection, you without doubt requisite a sound user account and password.
figure 2.2 suggests the three-tiered architecture of an iSQL*Plus configuration. the first tier is the customer's net browser, and the core tier is the Oracle HTTP server (net server) that receives requests from the browser and forwards them by means of Oracle web to the third tier, the Oracle database server. The Oracle net server returns outcomes from the database server lower back to the net browser for monitor. The three tiers may live on one machine but are customarily on three different ones.
determine 2.2 Three-tier architecture.SQL and the Oracle Database Server
in the midst of impeccable this utility lies the SQL language. SQL commands are sent from the customer utility, besides known as the entrance conclusion, to the server, or again end. These instructions ship instructions to the server to inform it what features to supply. The server responds through sending back a influence to the customer, where it's displayed by artery of the customer software. determine 2.three indicates a SQL observation that queries the description column of the route desk. The SQL observation is shipped to the Oracle server and the outcomes is displayed by SQL*Plus.
determine 2.3 SQL and the Oracle database server.user identity and password
To connect with the database and communicate by means of SQL*Plus, you ought to beget a user identity that has been created for you. For the applications of impeccable examples during this publication, you employ the consumer appellation student and the password live trained. note that the user id and password are not case delicate.
if you haven't yet created the pupil schema based on the guidelines on the associate internet site located at http://authors.phptr.com/rischert3e, you usually are not capable of log in with the student person identification and the learn password. You may want to continue to examine through this lab first, create the pupil schema, after which role the exercises in this lab.getting access to the Oracle Database Server
which you could access the Oracle server via a number of entrance-conclusion equipment. This publication will debate the expend of Oracle's own SQL*Plus application (accessible as a graphical windows atmosphere and as a command line interface) and the browser-primarily based iSQL*Plus.
This lab will educate you probably the most fundamentals of SQL*Plus, as this device is almost always present in any Oracle database ambiance. The disappear surfing monitors for SQL*Plus and the browser-based mostly iSQL*Plus are a tiny bit distinctive, however comfortably understood. that you could expend both SQL*Plus or iSQL*Plus to execute your SQL statements, or perhaps you chose an additional front-conclusion question device that besides permits you to enter SQL instructions. (The accomplice net web site to this e-book lists other alternative query tools.) ameliorations between SQL*Plus or iSQL*Plus are cited to you as you labor throughout the book. that you can assume that with very few exceptions the performance of iSQL*Plus and SQL*Plus are very similar, if no longer similar.
When working via this booklet, you beget a decision to create expend of either a browser and access iSQL*Plus or expend the SQL*Plus application attach in in your machine.SQL*Plus client for home windows
If the SQL*Plus application is attach in for your windows desktop, you can access it by determining programs, then Oracle, application construction, and SQL Plus. This launches the software and displays the disappear surfing dialog container comparable to determine 2.four. Enter because the user appellation scholar and because the Password live trained.
figure 2.four windows graphical user interface disappear surfing dialog container.
in case your database is installed on the identical computing device as your SQL*Plus customer, you don't should enter a value within the Host String box. when you are connecting to a far flung Oracle database, enter the Oracle internet connection string presented to you with the aid of your Oracle database administrator and recorded on your TNSNAMES.ORA file. you will live taught more about this particular file later.
figure 2.5 suggests how your betray appears after you beget efficaciously related to the server. comfortably, you beget got relative a reference to the Oracle database as the person student. The customer and the server may additionally now talk with each and every different.
determine 2.5 SQL*Plus on the spot.
should you remark the SQL> command instant, SQL*Plus is able to settle for your commands and you'll commence to category. here is the default instantaneous for SQL*Plus.
To log out, both classification exit or halt and press enter. then again, which you can elect Exit from the File menu or without problems expend your mouse to shut the window.Connecting with a web Browser: iSQL*Plus
as a substitute of the SQL*Plus utility program, which you can additionally expend the web-primarily based edition referred to as iSQL*Plus. To entry the iSQL*Plus interface through your net browser, you enter a URL. A log on dialog similar to pattern 2.6 will appear. here, the URL is http://scooby:5560/isqlplus and should surely live distinctive on your particular person installation.
a legitimate URL to connect to iSQL*Plus is in the variety of http://machine_name.domain:port/isqlplus. as an example, http://mymachine.acme.com:5560/isqlplus is an instance of a URL format. As a portion of the default Oracle setting up, you'll always remark the iSQL*Plus port quantity displayed. when you are dubious about your particular port number, are trying the default port 5560.
additionally solemnize in determine 2.6 that the domain isn't proven, only the laptop appellation scooby. because the laptop is on a autochthonous community, that you may pass over the area. instead of the appellation of the laptop, you could enter the IP address. in case your Oracle database server is on your personal machine and besides you are looking to entry iSQL*Plus, you could substitute localhost instead and your URL will examine http://localhost:5560/isqlplus. alternatively, which you can expend the IP address of 127.0.0.1.
determine 2.6 iSQL*Plus login display.
Enter the consumer identification and password in the usurp containers. You don't requisite to give the Connection Identifier (also referred to as Host string) to connect to the default database illustration.
determine 2.7 displays the monitor you remark once you beget effectively logged in. note the iSQL*Plus Workspace and the message "connected as pupil@orcl" on the upper appropriate-hand aspect of the monitor. This shows the identify of the login user, which is student, and the identify of the Oracle database illustration you're related to, referred to as ORCL.
figure 2.7 iSQL*Plus Workspace.
at the Enter statements text field, often known as the input enviornment, that you can enter commands. in case you are looking to elope a script (e.g., the script you should execute to generate the scholar schema), that you can enter the route and identify of the script or click on the load Script button to find the script. as soon as the script is loaded into the enter enviornment, which you could edit the script or with ease click on the Execute button to execute the script. To logout and return to the Login monitor, click on the Logout icon.starting the iSQL*Plus utility Server
For the home windows environment, the iSQL*Plus utility server is attach in as a home windows carrier as portion of the default Oracle database server setting up and constantly impeccable started automatically.
For different working methods—or in case you favor to nascence iSQL*Plus from the command prompt—use privilege here syntax %oracle_home%\bin\isqlplusctl birth. as an instance, if C:\ORACLE\ORA10 is your home windows Oracle domestic directory the region the information for the Oracle database and software server are attach in, you birth the iSQL*Plus software server with this command C:\oracle\ ora10\bin\isqlplusctl birth.
seek counsel from the associate net site for extra information on conventional iSQL*Plus installation and configuration questions.COMMAND-LINE INTERFACES FOR Sql*PLus
In region of a graphical person interface equivalent to SQL*Plus for windows or iSQL*Plus, you can besides expend a command-line interface. A command-line interface is obtainable with each Oracle edition. frequently, you will expend this interface in working methods corresponding to Linux or Unix. Even home windows has a command-line interface and you may remark it displayed in pattern 2.8. impeccable SQL*Plus and SQL commands operate for this interface just the identical. live alert that reckoning on the working equipment, your editor, as neatly because the reduce and paste instructions, may well live diverse.
figure 2.eight Command line-based SQL*Plus beneath the home windows working device.
To invoke SQL*Plus, you classification sqlplus on the respective operating equipment's command instant. For home windows you nascence SQL*Plus by using typing C:\> sqlplus from the home windows command immediate. during this instance, the username and password is offered to start SQL*Plus. which you can besides enter sqlplus and you may live triggered for the consumer appellation and password or sqlplus student, so they can on the spot for the password.The faraway Database and common Log-on problems
regularly the database resides on a computing device aside from your customer machine, otherwise you beget a decision of getting access to distinctive databases. In these circumstances you requisite to deliver the appellation of the database in the Host String field of the disappear browsing dialog box (see pattern 2.9) or the Connection Identifier container in iSQL*Plus. for instance, to connect with a database called ITCHY you beget got enter this appellation within the Host String field.
The host string suits an entry in a file called TNSNAMES.ORA, which lists the database's IP ply (or the computer name) and database illustration identify.
figure 2.9 SQL*Plus home windows graphical person interface log on dialog container.
essentially, the TNSNAMES.ORA file is a file containing a listing of databases with their respective technical connection tips. Your database administrator can back you with the configuration and setup of this file when you beget a far flung database setup.
Following is an excerpt of a TNSNAMES.ORA file. The entries to your file will certainly range. if you provide the host string ITCHY at log in, SQL*Plus will lookup the ITCHY entry within the TNSNAMES.ORA file. The HOST entry suggests the IP ply (in case you expend a TCP/IP network), which is listed as 169.254.147.245. on the other hand, that you would live able to enter the computing device identify. The SID entry identifies the identify of the Oracle instance; privilege here the instance is called ORCL. (in case you deploy Oracle with the default options, you should live asked to deliver such an illustration identify [SID]. a typical default identify is ORCL.)ITCHY = (DESCRIPTION = (ADDRESS_LIST = (tackle = (PROTOCOL = TCP) (Host = 169.254.147.245) (Port = 1521) ) ) (CONNECT_DATA = (SID = ORCL) ) ) SCRATCHY = (DESCRIPTION = (ADDRESS_LIST = (handle = (PROTOCOL = TCP)(HOST = milly.columbia.edu)(PORT = 1521)) ) (CONNECT_DATA = (SERVER = dedicated) (SERVICE_NAME = scraty.columbia.edu) ) )
Your TNSNAMES.ORA file may accommodate an entry called default. in case you achieve not give a bunch String in the disappear browsing dialog field, you can live linked to the database listed beneath the DEFAULT option. word, counting on your particular person setup, you might besides from time to time deserve to specify or leave out the .WORLD suffix next to the host identify (equivalent to ITCHY.WORLD or effectively ITCHY) in the TNSNAMES.ORA file. additionally, Oracle 9i and 10g installations enable the expend the format of the 2nd entry known as SCRATCHY. It makes expend of a carrier appellation in its region of the SID.
if you are using an Oracle 10g customer corresponding to SQL*Plus for windows, that you can expend a new feature called easyconnect. It lets you create a connection devoid of the entry being existing within the TNSNAMES.ORA file. as an instance, you could connect with SCRATCHY by using this connect identifier in the Host String box: milly.columbia.edu:1521/scraty.columbia.edu. It lists the computing device identify known as MILLY.COLUMBIA.EDU followed by artery of the port quantity (the default port of the Oracle database is typically 1521), adopted via the carrier identify SCRATY.COLUMBIA.EDU.commonplace log-on complications
however they can't possibly checklist impeccable of the blunders and options to impeccable log-on issues, listed here are two very ordinary Oracle error messages.
A TNS error always deals with the connectivity between the server and the client. here message is displayed if the relate identifier could not live resolved. This can live as a result of an invalid host string. assess the values and retry.ORA-12154: TNS: could not unravel the connect identifier distinct
The subsequent error happens if you entered the incorrect password or consumer appellation when the Oracle server attempted to authenticate you as a legitimate consumer. Double-determine the spelling of your user identify, which is scholar, and password, which is study. (in case you can not disappear surfing with this id and password, investigate the readme.txt file regarding the installation of the student schema.)ORA-01017: invalid username/password; logon denied Exiting from SQL*Plus or isql*Plus
There are a number of how to exit SQL*Plus. that you can class EXIT or elect Exit from the File menu within the SQL*Plus home windows edition. For iSQL*Plus, you click the Logout icon in region of typing EXIT as this could release device supplies. Exiting ends the session and the student consumer is no longer related to the database. although, there can live other client machines connected to the Oracle database; the server software continues to run, even with no matter if a consumer is connected to it.creating THE scholar SCHEMA
Now that you just know how to log on to the Oracle database the usage of SQL*Plus or iSQL*Plus, here is a fine time to study the readme.txt file you downloaded from the internet web page institute at http://authors.phptr.com/rischert3e and create the pupil schema in case you beget not already completed so.
until certainly mentioned, they are able to no longer differentiate between SQL*Plus and iSQL*Plus commands as a result of many are almost identical. For a list of unsupported commands remark Appendix C, "SQL*Plus Command Reference."
All instructions in SQL*Plus require the user to press the Enter key to execute them. In iSQL*Plus you impeccable the time deserve to press the Execute button. The reminder to press the Enter key or the Execute button are usually not protected within the leisure of the examples and workout routines during this book.Lab 2.1 workouts 2.1.1 identify Oracle's customer/Server application
establish which piece of Oracle utility is the client, which is the server, and how they talk with each different.
what's the role of SQL between client and server?
upon getting logged into SQL*Plus (not iSQL*Plus) with the consumer identification scholar and password learn, what assistance does the SQL*Plus screen betray you? (if you would not beget access to SQL*Plus, please reply the question with the aid of referring to determine 2.5.)
What achieve you live taught should you category recount pupil and press Enter? if you expend iSQL*Plus, click on the Execute button as an alternative of pressing Enter.
Execute the following command and recount what you see: present ALL.
determine which piece of Oracle software is the client, which is the server, and the artery they talk with every other.
answer: SQL*Plus or the browser exhibiting iSQL*Plus is the customer and the Oracle RDBMS is the server. In an Oracle 9i or 10g ambiance, Oracle internet is the protocol that facilitates the communications.
reply: SQL instructions are issued from the client, telling the server to role selected actions. The server sends lower back the results of these directions to the customer utility, the region they are displayed.
what's the role of SQL between client and server?
after you beget logged into SQL*Plus (not iSQL*Plus) with the user identity pupil and password live trained, what counsel does the SQL*Plus betray demonstrate you? (in case you shouldn't beget entry to SQL*Plus, please reply the query via referring to pattern 2.5.)
answer: The betray shows which version of SQL*Plus you're using, the present date and time, Oracle copyright counsel, and the version of the Oracle database you are related to. After this information is displayed, you remark the SQL> command instant. At this immediate you are in a position to enter commands.
PL/SQL is one other Oracle language addressed in a divorce ebook during this collection Oracle PL/SQL through instance via Benjamin Rosenzweig and Elena Silvestrova (Prentice hall, 2004).
reply: You determine concerning the constitution of the scholar desk, peculiarly its column names, no matter if those columns enable nulls and the datatype of each and every column.
to jot down SQL statements, you requisite to comprehend a desk's column names and their datatypes. The SQL*Plus recount command displays this information and indicates if a column does not enable null values.
Many SQL*Plus instructions may live abbreviated. for instance, recount may live shortened to DESC. Retype the command using this abbreviation and compare the effects. pattern 2.10 displays the outcomes of the recount command done in SQL*Plus.
figure 2.10 Executing the SQL*Plus recount command.
SQL*Plus is not case delicate; the person identification, password, and SQL*Plus commands might besides impeccable live entered in either higher or lowercase, or a combination of both. during this publication, they are in uppercase for handy identification. in the subsequent lab you're going to study formatting your SQL statements and when it's usurp to capitalize phrases.normal Datatypes
every column in Oracle ought to beget a datatype, which determines what classification of records will besides live kept.DATE
The DATE datatype is used to redeem date and time assistance. with the aid of default the screen structure for a date is DD-MON-YY. for example, July four, 2003 shows as 04-JUL-03. There are a number of functions that you may expend to exchange the betray layout or to present the time, which you will learn about in "Chapter four, Date and Conversion capabilities."quantity
Columns with the datatype quantity handiest permit numerical statistics; no textual content, hyphens, or dashes are allowed. A column described as quantity(5,2) can beget a highest of three digits before the decimal factor and two digits after the decimal point. the first digit (5) is known as the precision; the second digit (2) is mentioned because the scale. The smallest allowed number is –999.99 and the biggest is 999.ninety nine. A column definition with a 0 scale comparable to quantity(5) or number(5,0) makes it workable for integers in the range from –99,999 to ninety nine,999.VARCHAR2 and CHAR
The VARCHAR2 and CHAR datatypes maintain alphanumeric information (e.g., textual content, numbers, special characters, and so forth.). VARCHAR2 is the variable size datatype and probably the most time-honored alphanumeric datatype; its optimum size is 4,000 characters. The leading change between VARCHAR2 and CHAR is that the CHAR datatype is a arduous and fast-length datatype and any unused latitude is spotless padded with areas.
for example, a column defined as CHAR(10) and containing the four-persona size expense of JOHN in a row can beget six blank characters padded at the End to create the all size 10 areas. (If the column is saved in a VARCHAR2(10) column in its place, it outlets four characters handiest.) A CHAR column can redeem up to 2,000 characters.
The CLOB database permits you to store immense quantities of textual statistics. It replaces the lengthy datatype, which is desupported in Oracle 10g.different
Datatypes equivalent to BFILE or BLOB require access via unavoidable purpose functions in very tremendously really expert ways in which disappear beyond the targets of this booklet. in addition to the datatypes outlined, Oracle besides has further datatypes to back unavoidable country wide persona units (e.g., NCLOB, NVARCHAR2), intermedia datatypes, and spatial (geographic) data. Oracle besides gives you the capacity to create your own custom-made expostulate datatypes.
seek counsel from Appendix I, "Oracle Datatypes," for a detailed list of the quite a lot of datatypes. for many SQL operations, you usually expend the number, VARCHAR2, and quite a few DATE-linked datatypes. they're the most commonly used datatypes where the stately majority of statistics is kept.
Execute here command and recount what you see: exhibit ALL.
reply: you are going to remark a list of SQL*Plus environmental variables and their latest settings. using the SET command, many of them will besides live modified to suit your wants for a SQL*Plus session, which is described as the time in between should you log in and log out of SQL*Plus. should you birth your subsequent SQL*Plus session, despite the fact, impeccable commands could live set again to their defaults.
it's crucial to live alert here that SQL*Plus instructions, corresponding to demonstrate and DESCRIBE, aren't portion of the SQL language. you will commence to classification SQL commands using the SQL*Plus device within the next lab.
in case you expend iSQL*Plus, that you can alternate the ambiance variables and settings by artery of clicking the Preferences icon.Lab 2.1 Self-evaluate Questions
with a purpose to verify your growth, you should live in a position to reply privilege here questions.
The DESC command displays column names of a desk.
anyone can hook up with an Oracle database as long as he or she has the SQL*Plus utility.
Typing betray unlock at the immediate shows the version number of SQL*Plus you're the usage of.
The pervade column of the route desk is described as number(9,2). The highest can pervade of a person direction is 9,999,999.ninety nine.
answers appear in Appendix A, region 2.1.
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